Daily Sunspot Evaluation
Observation Sheet Tuesday, 2 April 1957
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 8
- Number of spots (f)
- 63
- Relative number (R)
- 143
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570402.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | -13 | 28E | ||||
| 2 | J – 2 | -19 | 71E | ||||
| 3 | D – 15 | -22 | 32E | ||||
| 4 | A – 5 | -21 | 16E | ||||
| 5 | A – 1 | -21 | 3E | ||||
| 6 | E – 20 | -15 | 50W | ||||
| 7 | G – 8 | 14 | 42W | ||||
| 8 | E – 10 | 28 | 49W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.